含钒页岩浸出槽搅拌速度优化的数值模拟  

Numerical Simulation on Optimization of Stirring Speed in Vanadium Shale Leaching Tank

作　　者：吴国良 倪红卫[1,2] 方庆[1,2] 王家辉 赵鹏 张华 WU Guo-liang;NI Hong-wei;FANG Qing;WANG Jia-hui;ZHAO Peng;ZHANG Hua(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Provincial Key Laboratory for New Processes of Iron Making and Steel Making,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉430081 [2]武汉科技大学钢铁冶金新工艺湖北省重点实验室,武汉430081

出　　处：《有色金属（冶炼部分）》2022年第1期56-66,共11页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家重点研发计划项目(2020YFC1909700)。

摘　　要：含钒页岩浸出槽是钒页岩湿法提钒浸出段的主要操作单元,存在固相分布不均、槽底矿物易沉积等问题。通过数值模拟研究来对比分析搅拌桨叶双层同速以及异速方案下对搅拌浸出槽内固液两相流搅拌功率和效率的影响。结果表明,当搅拌桨叶双层同速由1.3 r/s改变至1.7 r/s时,死区由5.02 m^(3)减少至2.03 m^(3),混匀时间由1501 s降低至1116 s,近自由液面平均速度也由0.32 m/s增大至0.56 m/s,因此搅拌桨转速选择1.7 r/s更为合适;搅拌桨叶双层异速可以得到与双层同速情况下基本一致的搅拌效果,当上层桨叶转速由1.5 r/s改变至1.7 r/s时,死区由2.95 m^(3)减少至2.33 m^(3),混匀时间由1261 s降低至1146 s,近自由液面平均速度也由0.44 m/s增大至0.54 m/s。因此搅拌桨转速选择上层1.7 r/s、下层1.5 r/s能在保持较低的搅拌功率同时能得到较好的搅拌效率。Vanadium-containing shale leaching tank is main operating unit of wet process for vanadium leaching section of vanadium shale,with problems such as uneven solid phase distribution and easy deposition of trough bottom minerals.Effects of two-phase flow on solid liquid in mixing tank were comparatively analyzed by numerical simulation under conditions of double-layer impeller at the same speed and different speed.The results show that when rotating velocity of double-layer impeller blades changes from 1.3 r/s to 1.7 r/s,volume of dead zone drops from 5.02 m^(3) to 2.03 m^(3),mixing time drops from 1501 s to 1116 s,and average velocity of near free surface rises from 0.32 m/s to 0.56 m/s.Therefore,it is more appropriate to choose 1.7 r/s stirring speed.When rotating velocity of upper impeller blade changes from 1.5 r/s to 1.7 r/s,volume of dead zone drops from 2.95 m^(3) to 2.33 m^(3),mixing time drops from 1261 s to 1146 s,and average velocity of near free surface rises from 0.44 m/s to 0.54 m/s.Therefore,when rotating velocity of upper impeller blade is 1.7 r/s and lower blade is 1.5 r/s,stirring power can be kept at relatively low level,and stirring efficiency can reach a high level.

关 键 词：钒页岩 浸出槽 数值模拟 桨叶转速 搅拌功率 

分 类 号：TF841.3[冶金工程—有色金属冶金] TF803.2